JPH08133669A - Method for controlling overhead travelling - Google Patents

Abstract

PURPOSE: To prevent the irregular winding of a rope by moving a carrier to a position over a bucket in the vertical direction in the case where the rope is wound up so as to separate the bucket from the floor. CONSTITUTION: A beam 16 is stretched between travelling rails 14, 14, and a carrier 20 is provided on a lateral travelling rail 18. A rope 30 is wound around a drum of a winding device 28, and a bucket 32 is suspended by the rope 32. At the time of hoisting the bucket 32 after catching a stored material with this bucket 32, brake is canceled so that the carrier 20 can be freely moved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an overhead crane, and more particularly to a method for controlling an overhead crane in which irregular winding of a rope around a drum is prevented.

[0002]

2. Description of the Related Art The construction of a yard equipped with an overhead crane will be described with reference to FIGS. Storage 10
On the side wall of the yard 12 storing the traveling rails 14,
14 is provided, and a beam 16 is provided between the rails 14 and 14.
Has been bridged. A traverse rail 1 is provided on the upper surface of the beam 16.
8 extends in the longitudinal direction of the beam 16, and a carriage 20 is installed on the traverse rail 18. This dolly 20
Is equipped with a winding device 28 having a drum 22, a motor 24 and a brake 26 shown in FIG.

A wire rope 30 is wound around the drum 22, and the rope 30 is hung on a sheave 34 of a bucket 32, and its tip end is connected to a load cell 36 provided on the truck 20. This load cell 36
Makes it possible to detect the tension applied to the rope 30. Although not shown, a rope different from the rope 30 for raising and lowering the bucket 32 is spanned between the carriage 20 and the bucket 32, and the bucket 32 can be opened and closed by the rope. Instead of such a bucket opening mechanism using a rope, an electric opening / closing mechanism may be provided above the bucket 32.

Wheels for traveling on the traveling rails 14 are provided on the lower surface of the beam 16, and a traveling drive device for driving the wheels is provided in the beam 16.
Further, the trolley 20 is also mounted on the trolley 20 by the traverse rail 1
A travel drive is provided for moving along 8. A brake such as a disc brake is provided in these traveling drive devices.

In the above-structured overhead crane, the bucket 32 is moved to a position above the target point by driving the traveling drive device of the beam 16 and the carriage 20, and the rope 30 is unwound to store the bucket 32 in the storage. 1
Land on top of 0. Then close the bucket 32,
The rope 30 is wound up and the bucket 32 is pulled up. Along with this, the carriage 20 and the beam 16 are moved to move the bucket 3
2 is moved to a position above an input port (not shown) such as a hopper,
Next, after lowering the bucket 32, the bucket 32 is opened, and the stored material grasped by the bucket 32 is put into the charging port.

[0006]

The rope 30 is the drum 2
As shown in FIG.
The rope pressing roller 38 is provided on the drum 22, and the rope 30
While holding the rope pressing roller 38,
An irregular winding prevention device may also be used.

That is, as shown in FIG. 2, when the bucket 32 lands on the inclined surface of the stored article 10, the bucket 32 moves so as to slide on the inclined surface. On the other hand, the carriage 20 does not move because the brake is applied, and as a result, the rope 30 is slanted. When the rope 30 is wound around the drum 22 while the rope 30 is thus inclined,
It becomes impossible to wind the rope 30 around the drum 22 in an aligned manner, and the rope 30 is wound around the rope layer B already wound around the drum 22, and irregular winding occurs. By providing the rope pressing roller 38 as described above, the irregular winding can be prevented to some extent, but the irregular winding cannot be surely prevented.

[0008]

According to a first aspect of the present invention, there is provided an overhead crane control method, wherein a pair of traveling rails and wheels extending in a direction orthogonal to the traveling rails and provided at both ends in a longitudinal direction of the traveling rails. A beam capable of traveling on a rail, a traverse rail extending on the beam in the longitudinal direction of the beam, a bogie installed on the traverse rail by a traveling device having a brake, and the bogie. Controlling an overhead crane having a take-up drum device having a drum axis centered in the longitudinal direction of the traverse rail, and a bucket suspended on a rope wound around the take-up drum device. In the method, the rope is unwound from the winding drum device, the bucket is landed on the stored object, and then the rope is wound by the winding drum device, the brake of the traveling device of the trolley is released, and the trolley is moved. Freely moveable And it is characterized in Rukoto.

A method of controlling an overhead crane according to a second aspect of the present invention is characterized in that, in the first aspect, when the rope is wound by the winding drum device, the winding drum device is intermittently operated. is there.

[0010]

When the winding drum is started to be wound with the brake of the traveling device of the truck released, the rope is tensioned with the bucket landing. By being pulled by this rope, the truck moves right above the bucket. Then, the rope is wound around the drum in a state where the rope is in a substantially vertical state, thereby preventing irregular winding.

When the winding operation is intermittently performed as in the second aspect, the bucket is gradually lifted while finely moving up and down. That is, there is a slight time lag between the timing at which the winding device stops winding and the time at which the brake is applied, and the bucket is slightly lowered during the short time after the winding is stopped and the brake is actually applied. Then, when the brake is applied, the bucket is stopped from descending, and a large tension is momentarily and shockly applied to the rope. This shocking tension pulls the carriage, and the carriage moves in the direction in which the rope is vertical. Therefore, by intermittently performing the winding operation of the winding drum device as in claim 2, the cart can be reliably moved to above the bucket vertically.
Turbulence is very reliably prevented.

[0012]

Embodiments will be described below with reference to the drawings. FIG. 1 is a time chart for explaining the operation of the overhead crane in the embodiment. The uppermost part of FIG. 1 shows the timing of hoisting and lowering of the winding device, and below that, there are buckets, carts, and beams. And the like are shown. The construction of the overhead crane itself used in the method of this embodiment is the same as that shown in FIGS. 2, 3, and 4.

One cycle is from the grasping of the stored material by the bucket to the end of the charging into the charging port, and FIG. 1 shows the operation contents of this one cycle. At the start of this one cycle, the bucket is located above the loading port of the yard and is in the rope unwinding state immediately after the loading is completed.

At the beginning of the start of this one cycle, the hoisting operation of the drum 22 and the operation of the beam traveling drive unit and the carriage traveling drive unit are started. As a result, the beam 16 and the carriage 20 move while pulling up the bucket 32. In the present embodiment, the winding is completed during this movement, and thereafter, only the beam 16 and the carriage 20 are moved.

During this movement, when the bucket 32 reaches near the destination, the drum 22 starts the unwinding operation, and the beam 16 and the carriage 20 move while unwinding the rope. Eventually, the carriage 20 reaches above the destination, the traveling is stopped by the brake, and only the unwinding of the drum 22 is performed. As a result, the bucket 32 is gradually lowered, and eventually, the bucket 10 is landed on the top surface of the stored article 10. At this time, the brake of the truck 20 is kept applied.

After the bucket 32 has landed, the winding of the rope 30 by the drum 22 is started. At this time, the motor 24 is intermittently operated and the brake 26 is operated by the motor 24.
Depending on the ON or OFF of, the brake is released or applied intermittently. That is, when the motor 24 is wound and rotated, the brake 26 is released, and the motor 24 is stopped and the brake 26 is operated at the same time.

As described above, there is a very short time lag between the timing at which the motor 24 is stopped and the time when the brake 26 is actually actuated to stop the unwinding rotation of the drum 22. The bucket 32 descends. Then, the rotation of the drum 22 is stopped at the moment when the brake 26 is actually actuated, and the descending of the heavy bucket 32 holding the stored article is stopped instantaneously. Then, due to this, a large tension is impulsively applied to the rope 30, and the truck 20 moves vertically upward of the bucket 32 so that the rope 30 becomes vertical due to this tension.

As described above, the rope 30 is wound up by the drum 22 while the rope 30 is in the vertical posture, so that the rope 30 is prevented from being wound irregularly.

By intermittently pulling up the bucket 32 in this manner, the bucket 32 eventually separates from the upper surface of the stored item. Therefore, the bogie 20 and the beam 16 are started to travel while the winding of the rope 30 is continued, and the beam 16 and the car 20 are caused to travel toward the insertion port. During this process, the winding of the rope 30 is completed, and thereafter, the carriage 20 and the beam 16
Are only moved.

When the rope 30 is reached near the loading port
When the trolley 20 starts to be unwound and the trolley 20 reaches above the loading slot, the beam 16 and the trolley 20 are stopped by a brake. Then, the unwinding of the rope 30 is continued, and after the unwinding of the rope 30 is completed, the bucket 32 is opened and the stored material in the bucket 32 is loaded into the loading port. By opening the bucket 32 for a predetermined time, loading is completed and one cycle is completed.

In the above embodiment, the brake of the truck 20 is released when the rope 30 is wound up so that the bucket 32 is lifted from the floor, but the brakes of both the truck 20 and the beam 16 may be released. .

[0022]

As described above, according to the control method for an overhead crane of the present invention, the brake of the winding device is released when the rope winding operation is performed in order to remove the bucket from the floor, so that the carriage is operated in the bucket. As it moves vertically upward, random winding of the rope is prevented.

By winding the rope intermittently as in claim 2, irregular winding of the rope can be prevented more reliably.

[Brief description of drawings]

FIG. 1 is a time chart illustrating an example method.

FIG. 2 is a vertical sectional view of a yard equipped with an overhead crane.

FIG. 3 is a schematic perspective view showing a configuration of an overhead crane.

FIG. 4 is a front view showing a configuration of a carriage of an overhead crane.

FIG. 5 is a sectional view of a drum provided with a rope pressing roller.

[Explanation of symbols]

 10 Stored Goods 12 Yards 14 Traveling Rails 16 Beams 18 Traverse Rails 20 Bogies 22 Drums 24 Motors 26 Brakes 28 Winding Devices 30 Rope 32 Buckets

Claims (2)

[Claims] 1. A pair of traveling rails, beams extending in a direction orthogonal to the traveling rails, and wheels provided at both ends in a longitudinal direction of the traveling rails, the beams being capable of traveling on the traveling rails, and the beams on the beams. Of the traverse rail extending in the longitudinal direction of the carriage, a carriage installed on the traverse rail by a traveling device having a brake, and a carriage provided on the carriage in the drum axis direction along the drum axis. In a method of controlling an overhead crane having a winding drum device in the longitudinal direction and a bucket suspended on a rope wound on the winding drum device, the rope is unwound from the winding drum device, When the rope is wound by the winding drum device after landing on the storage, the brake of the traveling device of the truck is released to allow the truck to move freely. Method. 2. The method for controlling an overhead crane according to claim 1, wherein when the rope is wound by the winding drum device, the winding drum device is intermittently operated.